OFFSET
1,1
COMMENTS
Column 4 of A189254.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 86*a(n-1) +773*a(n-2) -51741*a(n-3) +261147*a(n-4) +1858799*a(n-5) -7576930*a(n-6) -18369505*a(n-7) -63976305*a(n-8) +171881802*a(n-9) +1135450371*a(n-10) -543543057*a(n-11) -2342488484*a(n-12) -2204079757*a(n-13) +2422263217*a(n-14) +6125446560*a(n-15) -2843664887*a(n-16) -3962040267*a(n-17) +2834866226*a(n-18) -976262267*a(n-19) +196899773*a(n-20) +87195350*a(n-21) -15444135*a(n-22) -1459347*a(n-23) -867371*a(n-24) +86035*a(n-25) +10110*a(n-26) -675*a(n-27).
EXAMPLE
Some solutions for 3 X 4
..5..4..7..2....4..1..2..3....5..2..1..3....0..6..7..3....1..4..3..2
..0.10..1..3....0..8..6.10....0..4.10.11....8..1.11..2....8..0.11..6
..8..9..6.11....5..9.11..7....9..8..7..6....9..4..5.10....5..9.10..7
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 19 2011
STATUS
approved